The invention relates to a cerium-containing high-strength non-oriented silicon steel thin strip and a preparing method thereof. According to the technical scheme, the cerium-containing high-strengthnon-oriented silicon steel thin strip comprises chemical components including, by weight, 3.0%-3.5% of Si, 0.5%-1.0% of Al, 0.1%-1.0% of Mn, 0.01%-0.03% of Ce and the balance Fe and inevitable impurities. Smelting is conducted according to the chemical components of the cerium-containing high-strength non-oriented silicon steel thin strip, a slab is formed in a casting manner under the condition of 1400 DEG C to 1550 DEG C, the slab is subjected to hot rolling under the condition of 1200 DEG C to 1300 DEG C, and a hot-rolled plate with the thickness being 0.8 mm to 1.5 mm is obtained; then thehot-rolled plate is subjected to cold rolling under the condition of the room temperature to reach the thickness being 0.1 mm to 0.3 mm, and the cerium-containing non-oriented silicon steel thin strip is obtained; and then the cerium-containing non-oriented silicon steel thin strip is subjected to recrystallization annealing, and the cerium-containing high-strength non-oriented silicon steel thinstrip is obtained. The cerium-containing high-strength non-oriented silicon steel thin strip and the preparing method thereof have the beneficial effects that the technology is simple, the productioncycle is short, and the preparing cost is low, and the prepared cerium-containing high-strength non-oriented silicon steel thin strip has high strength, low iron losses and high magnetic induction.